     * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        body {
            background-color: #f5f7fa;
            color: #333;
            line-height: 1.6;
            padding: 20px;
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 0 20px rgba(0, 0, 0, 0.1);
            padding: 30px;
        }
        h1 {
            text-align: center;
            color: #2c3e50;
            margin-bottom: 30px;
            font-weight: 600;
        }
        .input-section {
            display: flex;
            margin-bottom: 30px;
        }
        .input-section input {
            flex: 1;
            padding: 12px 15px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
            margin-right: 10px;
        }
        .input-section button {
            background-color: #3498db;
            color: white;
            border: none;
            border-radius: 4px;
            padding: 12px 20px;
            cursor: pointer;
            font-size: 16px;
            transition: background-color 0.3s;
        }
        .input-section button:hover {
            background-color: #2980b9;
        }
        .filter-section {
            display: flex;
            justify-content: center;
            margin-bottom: 20px;
        }
        .filter-section button {
            background-color: #ecf0f1;
            border: none;
            padding: 8px 15px;
            margin: 0 5px;
            border-radius: 4px;
            cursor: pointer;
            transition: all 0.3s;
        }
        .filter-section button.active {
            background-color: #3498db;
            color: white;
        }
        .task-list {
            list-style-type: none;
        }
        .task-item {
            display: flex;
            align-items: center;
            padding: 15px;
            border-bottom: 1px solid #eee;
            transition: all 0.3s;
        }
        .task-item:hover {
            background-color: #f9f9f9;
        }
        .task-item.completed {
            background-color: #f8f9fa;
        }
        .task-checkbox {
            margin-right: 15px;
            transform: scale(1.2);
        }
        .task-content {
            flex: 1;
        }
        .task-title {
            font-size: 16px;
        }
        .task-item.completed .task-title {
            text-decoration: line-through;
            color: #95a5a6;
        }
        .task-actions {
            display: flex;
        }
        .task-actions button {
            background: none;
            border: none;
            cursor: pointer;
            margin-left: 10px;
            font-size: 16px;
            padding: 5px;
            border-radius: 3px;
            transition: background-color 0.3s;
        }
        .edit-btn {
            color: #f39c12;
        }
        .edit-btn:hover {
            background-color: rgba(243, 156, 18, 0.1);
        }
        .delete-btn {
            color: #e74c3c;
        }
        .delete-btn:hover {
            background-color: rgba(231, 76, 60, 0.1);
        }
        .edit-input {
            width: 100%;
            padding: 8px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 16px;
        }
        .empty-state {
            text-align: center;
            padding: 30px;
            color: #7f8c8d;
        }
        .stats {
            text-align: center;
            margin-top: 20px;
            color: #7f8c8d;
            font-size: 14px;
        }